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-   -   Reserved for MF - Sequence 4788 (https://www.mersenneforum.org/showthread.php?t=11615)

Andi47 2009-06-03 16:52

[QUOTE=jrk;175742]Next line has a c143.[/QUOTE]

I just see in the database: 7771 curves at 43e6 by Alex Kruppa within only a few hours??? This must be a HUGE cluster.....

jrk 2009-06-03 17:19

Got an ECM factor of the c143.
[code]Using B1=3000000, B2=5706890290, polynomial Dickson(6), sigma=1112855099
Step 1 took 9656ms
Step 2 took 4870ms
********** Factor found in step 2: 531088977736851265980175972579817623709
Found probable prime factor of 39 digits: 531088977736851265980175972579817623709
Composite cofactor 183015474594334048980664757999030271952712067435178305507209636383593062935862719457319693469129406018351 has 105 digits
[/code]

I am GGNFS'ing the c105

10metreh 2009-06-03 18:55

[quote=Andi47;175752]I just see in the database: 7771 curves at 43e6 by Alex Kruppa within only a few hours??? This must be a HUGE cluster.....[/quote]

The P39 must have been a MASSIVE miss if that was true!

jrk 2009-06-03 20:49

[QUOTE=jrk;175757]I am GGNFS'ing the c105[/QUOTE]

[code]prp45 factor: 235657500907163308436573633500513257290545453
prp60 factor: 776616377114312792640247126817458598582668273075707980341067
[/code]
Next line has a c134.

Mini-Geek 2009-06-03 21:42

[url]http://factorization.ath.cx/search.php?id=39376136[/url] (the c134 at 4788.2410)
[code]850000000 85000000000 193436 Bill Gates June 3, 2009, 11:19 pm[/code]Something tells me that's not entirely accurate...

akruppa 2009-06-03 21:56

Can Syd tell us the IP address that was used to post these bogus results? Maybe we can match it against IP addresses used for posting here.

Alex

jrk 2009-06-04 01:51

I did 2000 curves @ B1=3000000, B2=5706890290 on the c134.

axn 2009-06-04 05:28

I am running some 11e6 curves on it. Meanwhile, if someone can get me a reasonable poly within the next 24 hrs, I can finish the whole thing by myself by next Wednesday.

schickel 2009-06-04 05:36

[QUOTE=axn;175837]I am running some 11e6 curves on it. Meanwhile, if someone can get me a reasonable poly within the next 24 hrs, I can finish the whole thing by myself by next Wednesday.[/QUOTE][code]name: a4788
n: 32299880300827036383291069260216240546437982947532075193586864704343482306012701350943737668991851271506016829148932349430377649964591
skew: 566511.72
# norm 4.54e+018
c5: 62160
c4: 84970653748
c3: -50400906361463526
c2: -22608498037500947529427
c1: 8254349633026004383984255604
c0: 764487387105372569952027598371325
# alpha -6.35
Y1: 1009413309108919
Y0: -55352318459081197491472094
# Murphy_E 4.44e-011
# M 5451045075518794245451319373483057172745436076954176258939655826956455779115055128915903697457313310053919157605347637622239870551623
type: gnfs[/code]According to def-par.txt, 3.48e-11 is a good score. Let me know if this is reasonable enough.

axn 2009-06-04 06:12

[QUOTE=schickel;175839]Let me know if this is reasonable enough.[/QUOTE]

More than! With the following parameters (and expected 20M relations), my timing indicates that I can knock this bad boy off in around 60hrs (WCT). Unfortunately, since I am out Saturday thru Tuesday, it doesn't really matter -- Wednesday is when you'll get it. So till tomorrow, I'll continue the ecm, and start off the sieving in another 24 hrs.
[CODE]rlim: 12000000
alim: 12000000
lpbr: 28
lpba: 28
mfbr: 54
mfba: 54
rlambda: 2.5
alambda: 2.5
qintsize: 100000
[/CODE]

EDIT:- If somebody with exceptionally strong PERL-fu can tell me how to modify factMsieve.pl so that I can report the factor automatically to Syd's database by calling a URL, much appreciate it.

EDIT2:- If it helps: The url to call is http://factorization.ath.cx/search.php?query=<N>&reportfac=<f>. sub getPrimes in factMsieve.pl is where it scans for factors.

schickel 2009-06-04 06:19

[QUOTE=axn;175843]More than! With the following parameters (and expected 20M relations), my timing indicates that I can knock this bad boy off in around 60hrs (WCT). Unfortunately, since I am out Saturday thru Tuesday, it doesn't really matter -- Wednesday is when you'll get it. So till tomorrow, I'll continue the ecm, and start off the sieving in another 24 hrs.[/QUOTE]Let me know what your cutoff time for the poly is; I can leave the search running until then, just in case something better turns up.


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